I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
presale parsley perusal presell parasail parcel parasol prosily pursily porously prissily pricily
resale presale resail reseal resile resole foresail versal
presa pares peres pores prees prese press preys pries pyres apres